According to the report, Annalisa Schulze, of Wake Forest, drowned by accident.
RELATED: Friends await answers after teen found dead in Falls Lake
The medical examiner said the 19-year-old had marijuana and LSD in her system before she drowned.
On August 7, Schulze's body was found floating in Falls Lake. Her death was initially being investigated as a homicide, as authorities awaited autopsy results.
Following her death, one of her friends told ABC11 that Schulze graduated from Wakefield High School and was home for the summer from East Carolina University.